Korekiyo Nanzô is a teacher at Miden Academy, where he instructs the exorcist students of Class 1-A in a world where digital manifestations of the dead, known as Dead Accounts, must be exorcised. He is physically distinctive, with very long black hair and wire-rimmed glasses. Initially, he presents a twisted and overly dramatic personality that can come across as unsettling or exaggerated. As the narrative unfolds, it is revealed that these extreme behaviors are rooted in deep trauma from his past, which not only explains his demeanor but also allows for a more sympathetic understanding of his character. His primary role in the story is as an educator and mentor to the young exorcists, including the protagonist Souji Enishiro, and he is involved in the academy’s efforts to combat supernatural threats. His relationships are largely defined by his position, connecting him with the main cast through teaching and guidance. Character development centers on the gradual revelation and processing of his traumatic history, which softens his initial impression and adds complexity to his persona. Details about his specific exorcist abilities are not extensively highlighted, but as a faculty member he is expected to be competent in the use of Cyberkinesis, the power that allows exorcists to fight Dead Accounts.